Measurements of Atmospheric Gaseous Mercury, Aerosol Trace Metals and Stable Lead Isotopes Over the South-Western Indian Ocean

Details Measurements of Atmospheric Gaseous Mercury, Aerosol Trace Metals and Stable Lead Isotopes Over the South-Western Indian Ocean Measurements of Atmospheric Gaseous Mercury, Aerosol Trace Metals and Stable Lead Isotopes Over the South-Western Indian Ocean

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmos13f..08m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #OS13F-08

Physics

1615 Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), 3339 Ocean/Atmosphere Interactions (0312, 4504), 4801 Aerosols (0305, 4906), 4870 Stable Isotopes (0454, 1041), 4875 Trace Elements (0489)

Scientific paper

During November 2007, continuous measurements were made of total gaseous mercury (TGM) over the Indian Ocean during a two week cruise aboard the R/V Revelle from the Seychelles to Mauritius. Hg concentrations were consistently low during the cruise (1.0-1.4 ng m -3) similar to concentrations observed between 1994 and 2006 at an observatory in South Africa (Slemr et al., 2008). There was no significant diurnal signal observed during the cruise and the low variability in Hg is consistent with well mixed air masses and a long lifetime of Hg in the atmosphere.
During this cruise size segregated and bulk aerosol samples were also collected using a high volume aerosol sampler. The aerosols were analysed for major ions, trace metals (Al, Fe, Ba, Mn, Co, V, Cr, Mo, Sr, Pb, Cd, As, Zn, Cu and Ni) and stable lead isotope ratios. The concentrations of most of the metals were similar to those observed in previous aerosol studies over similar regions of the Indian Ocean in 1986 (Chester et al., 1991) and 2002 (Witt et al., 2006). Aerosols were enriched above crustal and oceanic sources in many trace metals such as Pb, Cd, Ni and Zn although air mass back trajectories suggest air encountered had been over the ocean for at least 5 days prior to collection. Metal concentrations over the remote Indian Ocean appear to be intermediate between values reported for the remote Pacific and Atlantic oceans. Lead isotope ratios (206Pb, 207Pb and 208 Pb) in the aerosols fell into a group with a relatively radiogenic signature different to the Pb characteristic of Australian ores, where trajectories suggest air originated. The isotope ratios also differ to those observed in South African cities and are closer to the lead composition more typical of coals.
Chester et al., (1991) Mar. Chem., 34; 261-290 Slemr et al., (2008) GRL, 35 (11) doi:10.1029/2008GL033741 Witt et al., (2006) Atmos. Env., 40; 5435-5451

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